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PUMP DRIVE MECHANISM

Publishing Venue

Xerox Disclosure Journal

Abstract

This disclosure relates to a pump drive mechanism generally indicated 10 which is intended for use in conjunction with dispensing silicone oil to a heated fuser oil. The pump drive mechanism is designed to transform the high amplitude, high frequency rotational motion of a cam 12 into low amplitude, low frequency translation motion for driving a sump plunger 14 within a pump body 16. Rotation of the cam 12 causes oscillation of a lever arm 18 about its pivot 20. 1Jpward movement of the arm causes a driver pawl 22 attached to the lever arm to rotate a ratchet wheel 24. A keeper pawl 26 retains the ratchet wheel while the lever moves downwardly causing the driver pawl to index the wheel 1 tooth. An eccentric 28 on the ratchet wheel causes a link 30 to reciprocate as the ratchet wheel rotates. The link 30 is attached to the pump plunger to thereby effect concurrent translational movement thereof. Springs 32 and 34 maintain the lever arm 18 loaded against the cam 12 and the pawls 22 and 26 loaded against the ratchet wheel 24.

Country

Undisclosed

Language

English (United States)

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CEROX DI§CLOSURE JOURNAL

PUMP DRIVE MECHANISM Proposed Borden H. Mills 111 Classification

US. C1. 355/3FU Int. Cl. G03g 15/00

I

26

This disclosure relates to a pump drive mechanism generally indicated 10 which is intended for use in conjunction with dispensing silicone oil to a heated fuser oil. The pump drive mechanism is designed to transform the high amplitude, high frequency rotational motion of a cam 12 into low amplitude, low frequency translation motion for driving a sump plunger 14 within a pump body 16. Rotation of the cam 12 causes oscillation of a lever arm 18 about its pivot 20. 1Jpward movement of the arm causes a driver pawl 22 attached to the lever arm to rotate a ratchet wheel 24. A keeper pawl 26 retains the ratchet wheel while the lever moves downwardly causing the driver pawl to index the wheel 1 tooth. An eccentric 28 on the ratchet wheel causes a link 30 to reciprocate as the ratchet wheel rotates. The link 30 is attached to the pump plunger to thereby effect concurrent translational movement thereof. Springs 32 and 34 maintain the lever arm 18 loaded against the cam 12 and the pawls 22 and 26 loaded against the ratchet wheel 24.